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aleksley [76]
4 years ago
7

Joe has finished 14 of the 30 lessons in his piano book. Lindsey has finished the same percent of lessons from her piano book, b

ut her book contains 45 lessons. How many lessons has Lindsey finished?
Mathematics
2 answers:
Ksenya-84 [330]4 years ago
8 0

Answer:

Step-by-step explanation:

14 is 46.67% of thirty so you’d need to find out what 46.67% of 45 is which would be 21

Hope this is right and it helped XD

AveGali [126]4 years ago
8 0

Answer:

Lessons has Lindsey finished = 21

Step-by-step explanation:

It is given that,

Joe has finished 14 of the 30 lessons in his piano book. Lindsey has finished the same percent of lessons from her piano book, but her book contains 45 lessons.

<u>To find the percentage of lessons of Joe</u>

Percentage = (14*100)/30 = 140*3 = 46.67%

<u>To find the lessons has Lindsey finished</u>

Lindsey has finished the  46.67% of lessons from her piano book

46.67% of 45 = (46.67*45)/100 = 2100/100 = 21

Therefore lessons has Lindsey finished = 21

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John will pay $8.68 for the combined cost of 1 pound of banana and 1 pound of cherries.

Let: b=cost of banana per pound and c=cost of cherries per pound

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3c + 2b =$24.95

Equation 2: The cost of bananas is $6.50 less than a pound of cherries.

b= c - $6.50

We can substitute the second equation into the first one to solve for the cost of cherries per pound.

3c + (2)(c-$6.50)= $24.95

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b= $7.59 - $6.50 = $1.09

The combined cost of 1 pound of banana and 1 pound of cherries is $1.09 + $7.59 or $8.68.

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By applying the concept of the inverse of a function and <em>algebraic</em> handling, we conclude that the inverse of f(x) = (- 2 · x + 2)/(x + 7) is g(x) = (- 7 · x + 2)/(x + 2).

<h3>How to find the inverse of a function</h3>

In this question we have a <em>rational</em> function f(x) and finding its inverse consists in clearing x in terms of f(x). Prior any algebraic handling, we need to apply the following substitutions:

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By applying the concept of the inverse of a function and <em>algebraic</em> handling, we conclude that the inverse of f(x) = (- 2 · x + 2)/(x + 7) is g(x) = (- 7 · x + 2)/(x + 2).

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